What is the recommended dose of Augmentin (amoxicillin/clavulanate) suspension for adults?

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Augmentin Suspension Dosing for Adults

For adults requiring Augmentin suspension, the standard dose is 500 mg amoxicillin/125 mg clavulanate three times daily or 875 mg/125 mg twice daily, with the 875 mg formulation preferred for respiratory tract infections. 1

Standard Adult Dosing Regimens

Mild-to-Moderate Infections

  • 500 mg/125 mg three times daily is appropriate for most mild-to-moderate infections including urinary tract infections, skin infections, and uncomplicated respiratory infections 1, 2
  • 875 mg/125 mg twice daily is the preferred regimen for respiratory tract infections including acute bacterial rhinosinusitis, community-acquired pneumonia, and acute exacerbations of chronic bronchitis 1, 2

High-Risk or Severe Respiratory Infections

  • 2000 mg/125 mg twice daily (pharmacokinetically enhanced formulation) is recommended for adults with risk factors including recent antibiotic use within 4-6 weeks, treatment failure, moderate-to-severe illness, or areas with high prevalence (>10%) of penicillin-resistant Streptococcus pneumoniae 1, 3

Treatment Duration by Indication

  • Acute bacterial rhinosinusitis: 5-7 days 1, 2
  • Community-acquired pneumonia: 5-7 days if afebrile for 48 hours and clinically stable 2
  • Streptococcal pharyngitis (when indicated for chronic carriers): 10 days to prevent acute rheumatic fever 2
  • Animal or human bites: 5 days at 500 mg/125 mg twice daily 2

Critical Dosing Pitfalls to Avoid

  • Never substitute two 250 mg tablets for one 500 mg tablet - this results in excessive clavulanate dosing (250 mg vs 125 mg) and significantly increases gastrointestinal side effects, particularly diarrhea 1, 2
  • The clavulanate component is fixed at 125 mg per dose in standard adult formulations regardless of the amoxicillin content 1
  • If no clinical improvement occurs after 72 hours, switch to a respiratory fluoroquinolone (levofloxacin or moxifloxacin) or escalate to high-dose amoxicillin/clavulanate if not already used 1, 3

Special Clinical Scenarios

Asplenic Patients (Emergency Standby)

  • 3 g starting dose followed by 1 g every 8 hours for unexplained fever or constitutional symptoms 1
  • For animal bites in asplenic patients: standard 5-day course 1

Lyme Disease with Cellulitis

  • 500 mg three times daily for 14 days when covering both early Lyme disease and bacterial cellulitis 2

Administration Considerations

  • Augmentin should be taken at the start of a meal to enhance absorption and minimize gastrointestinal side effects 4
  • Peak serum levels of amoxicillin occur at 2 hours (11.23 µg/mL) and clavulanic acid at 1 hour (2.55 µg/mL) after oral administration 5
  • The suspension formulation achieves adequate tissue penetration with peak sputum concentrations of 1.31 µg/mL for amoxicillin at 4 hours 5

References

Guideline

Augmentin Dosing Recommendations

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2025

Guideline

Amoxiclav Dosing Guidelines for Adults

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2025

Guideline

Amoxicilina-Ácido Clavulánico Dosing Guidelines

Praxis Medical Insights: Practical Summaries of Clinical Guidelines, 2025

Guideline

Guideline Directed Topic Overview

Dr.Oracle Medical Advisory Board & Editors, 2025

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

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